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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985ee26567192b15e200acdfd5b9192fce64343a6e2687e627abefadc17f93a5' 
  AND token = '9NKtE5QnKzdmzJBq2fVVMUPmy102rsI/gRFGDe95Awg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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