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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03140ec7b7470ee550de3d827db82a39e67b32adaa4855e3a71e957adf6e6ed' 
  AND token = '+JLRqHVDRWd5SJtw6i5W26YYqWo8woVyGmdEueXp+BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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