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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27559f8d888cdd9e8b52094841ed588030f4a7a33cb55926026d0bf21a7d98fc' 
  AND token = 'rzCo7F9CFMi/8Buo8P8cha3JLDluHEFDJynhZRsdQdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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