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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b0df5fb0c0460d5e0131cb2e96a5c4e9f28616dc0f17908eefabad2152b457' 
  AND token = '0PjeY0c6Q3hUBC2A4UkO2WS4tL5bR3JTAbiP1FW1X4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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