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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833545270e3be6e760449fdce0d0612e572e164bfc848500d67e6c3e0cac3b21' 
  AND token = 'g0ieW5ZRw9tPKGOHLU9KqCXYrQtRBseR2REqGUsdbuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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