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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc26f9a2dd01f75f669dd0d680e59527a1f59877909a92af46fd8a92de51c42a' 
  AND token = 'y9XxWfKORMqdjRwh/mEpxtvlKbWFDH6HKppFbnA93Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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