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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1ae4ea5ad06ee4bf9aa5e18a4808039ae339a103eacb054d474e4563d3cb39' 
  AND token = 'b2fXAicDv+7cgOjm4mx3Z8Xs0nRex5Sw/dBtYAtMTo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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