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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f67bff2b3e30c4b11f3bcd7fc9d4857c1c38c32cccf14b89f263499cd8a45e' 
  AND token = 'FTKEnTsJ9joy4dL3yxbHtlBefYxVBm49ETJ+PI1QkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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