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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a5f5c9a855c3b984d1dd721ff388938f19d50b1441758d0bcf976a5d410a168' 
  AND token = 'g4T450uUR11wB58QDH+FTPl720z0vYsufXDI3b2qsj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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