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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c30d294ff207c8d2e6a8bbf0c053ed73ea768db190138c578a1c1a61192d3' 
  AND token = '7DdnV3WhNwD9pzq7Si83RK3Xu/p/gkar3hL4NsO5DL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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