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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168dcee7f6b93e582a2a8cf34a5c0fc5be153faf20c7123f2b48930d6142d982' 
  AND token = 'kvR/MeIkupfJ0Ft2QIvrLsgKl0PeBD1f9xhXRrhzz6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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