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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef402a33818d9af1f39d5c855253b0f0660aa562a6389cd3ef73d9c30f73435' 
  AND token = 'Yk4i2Ji1/x0ddUyjZ0vfP/pHkgtybYWnUpmGS7jZXA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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