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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b032df8aa1a3976f6cf0d92aef79464b13d7bd955c43833da4cb5232b5fd4a' 
  AND token = 'DPx14RX12rjmsPrUN2ENGfTctFmpJcB553/CxTf43iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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