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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534476acb1b7278ac92e377ac9a1807d900ae6e8d9cd19f74e14dfb30ea70392' 
  AND token = 'qErjzb4vEXSm+ryKJWmUq79agx/T7MfujCJ2b8tn0bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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