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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539be848c67a550c25fa2825719e3a86559de658be9782d25fe9493e34d7a39e' 
  AND token = '5H1jo7Bmdx9PtoBIErePebAqS3rDy4AFAlrZI6L+o6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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