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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7f978e58833798af2b10240079b4bb170daf49563503d64765ceda6213daf3' 
  AND token = '8nB2c3p/YpZwExs4RCnElBqr48R6C85Exl/1qynWe6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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