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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba075f986d04d049ce8efcf75d4a4695f09b811ea9deb1b2e33e8064a8ae9a1' 
  AND token = 'DgmO1tqCO4YFWhZkXu26DOp34uEUwacxdN8n/JRXiXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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