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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a9a1f02ec4c563a3fa5c470bf53ba353ff391e318086a749e518329da9df38' 
  AND token = 'rA1nYM091F4m2b9bu7jSUK9U+I+kaq3Dbtn5n2PF2OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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