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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf8b2c4c960cfa12802015e5dfe38c29cd04bdd0c958f64b977347e75c336df' 
  AND token = '61wtAvkd0hZv8vc4NydaOB1td8+uoO+A0o7fjbwZ3Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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