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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b93d3812b09ab89ed5c5bf3ef85b4dd60bf7ea2a16f93443fd9fe3828c6e07' 
  AND token = 'jq6Y7ek0bDKdYvrk1aAU/He2ioNlQXyxbs3fMl2jkUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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