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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634a6f1a131aafc6c8bf17606c54182a1dbae5ffb3674c213201faa270aca7d' 
  AND token = '2ZXShLKrm8udpoThwtZKVcMVP1iPmDNaR41m6zAkZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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