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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0157e276cfed798c88f9215abc49b56f60b5f74bd0b62c231bae193919c68898' 
  AND token = '94IZ3ZMMi07jxmLs+dMTW1tN6u+voa8RLODYy99kZLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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