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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3cf61c761cb19c3c840b32ade4eeae2d41a22e358a999159f8cb003246b98a' 
  AND token = 'OoDu13Q2Jav6L/yqSAS63nGZsQtK7Urxj8dX4/2Q7jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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