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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46dd4fc9e9d22b3a1fe8912841e53ffb943a2991ac02e486b1c0319986083c5b' 
  AND token = 'ULLOcwlXjcjf9NHpuS6u7XeKsUwra9CD/STCA19TA9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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