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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4fb9d7a39f40a9621f191255ac894c3bb82a7c2502c299a41010bfb54bb83a' 
  AND token = 'R6Bzomw3wTMtqc3lq2PljITIzV8XAyrqTb3nhqTAyME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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