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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a0e393aff3c98db12d5f75c117e9ea3586f5be8fee64e7cf88d51f92819725' 
  AND token = '6qnLno8Fr3CbQ7zFPe0X/5Eyyjpc1KY59/p6lWm3JuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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