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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3fe7e6c62fbe7c320ecd0887a6c9711bae95e6b166adf1f92155335cf58945' 
  AND token = '7saVDYCX+mnpm8tOYWMkRzhSphJDuA0gAHTVoKkc1QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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