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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ba5aa45f93de2137103e57e589b9d9142ee08fd69b27ee71adc1a0236f707d' 
  AND token = 'pan9Xrut31DEPXjyID+H2WRt55FVM5ciYh8dQWL06pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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