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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbbbef42c9c2b5f7e73e9b6875adc4e8e6622610815c5c112c5cd2fb6ebbc95' 
  AND token = 'g4g561a7lhhvyJchSkOfuWBZBGtCeY0ST8n4ygCyEqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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