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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cf2ed4641139b3a1d0fe291bf12c7f8e78ee024422a73ad71b8d18e67f2adc' 
  AND token = '7/1lTwex0K2R00S0X+bTi3zj2V5aPJQlErLT6EZp5aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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