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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955fd251267fe85cc6ddde0aefe761c2ba7f43a9659654bbcd63a96f66e81526' 
  AND token = 'oLcx8UHItvC+stZ9+FPairSU1a1GikEHzvLbfvC3NwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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