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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d7bef1c59c2ee1b229d1a7950d3a800b0dabccc9578f54a787dd401700a465d' 
  AND token = 'IzZZ9cRAA6V5Q52j4yAVS6G088diK4R8bjVTsdqgB/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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