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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d665f2a0ea5fd20e09959957202f20ca432463067c64dfffcd63b6b96fb3a0' 
  AND token = 'N8XZD89OMLPY03VAcgvh8LFaSDMrw3a1809Df1tR5zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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