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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ccb6a3f2c84e9407b098918e3f0d8d15c0a199e46779da0a1f82c3f321f17' 
  AND token = 'u/yGx76hsmCazm2yCp3Q2J0AxqLkCxHGCkBkkIrW5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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