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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3286870c93bc1cca27a7c70aeb007b7b7ec45e75563a138c01f8beb8ca5d285a' 
  AND token = '/JchL6moOABSvw5uGw0tS9hmpgy/7bBZHq0itYKIbGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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