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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68914cc148f198d33cf62110d0d8a689ed23435b85601de1983ecf53b993e650' 
  AND token = 'uC22g3LsrLw6EXKQt475pRxpCu9iZpN7aj6vc/dr6/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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