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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97973fdd5452fe63202bce9eaae039eba6f50f3f27ff88309256d33af25099d2' 
  AND token = '0V2/UCqLsGdpHjVhma0bImR807Ni8Y1dewr1Sn8TRsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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