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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb1a269654c30c75144229c51d6625d85554feb105ee71fe2ef8d520094dfc1' 
  AND token = 'olWkq8cmb4fRxGXqF4o7qBoRDat0caUTCh1YI0K1R+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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