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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99bcb54362c83d6c8649ef4373b2f5d3c391dc1d98acd5f470f90427682a6674' 
  AND token = 'iJeJgMp3bgnMN1QPLIf2L7h8Dwzrh6H/FE4fWe4dw5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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