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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55695a3cb1fc96e71dbc8ceec3abe5b9d18a92540148d1f5896c6ea2b7bc072a' 
  AND token = '0nm+z3w3JKsnod2Q9PsJ3ge+3StBHyCNbUa4rqtgoYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}