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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6de2d04b2c0645bd279615e9b2ca07382d039b76df5855a0612d6fab552badb' 
  AND token = 'OSER6dATHkEykbMFg3d0tt/36rJ+zg9ekMsj3ZB79HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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