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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c4d1555e25a943aa80870aa9d209fe702a5ad2e0e2c28392781dcefb528da1' 
  AND token = 'mEw47yzTqS+MbBUK1NGm6YfPDCGuUg9Abr2hwfdhbNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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