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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0119857e7d057d400a62da25924c0ad80802cf22fac6e2a258dc5976a1ba00b0' 
  AND token = '0oRda/+qXcrt97TC3UQ32tbHKxYqSXibNVihgl95OKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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