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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc49f7c86d719c99ac4289cbd7bb1227bdf4f5beb3fb86883c3cfaee1d38aee3' 
  AND token = 'dDdaV/+xot+HFOJv78QAReDTiCk1ik8l9kVQTjfdMuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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