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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84160b1b3a75ba7fb3ae2dfdd3b0a715a8f8832f2d33d7a5bbf63096d10ae5f' 
  AND token = 'NSbjVH6Hmmnw0A4g4+y0O7bBm2cA5kFBZD9lSWssiV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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