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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '266f82ad0f4b0038f130d37a96872c5ec4e49b2f5f17f1875fe78992f61197f3' 
  AND token = 'WPi98RL7ZhiSVoFof25iEzKsXm1Y1Q3E1tHaNVxY9F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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