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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793e3ed8121f1448365de4aa963a08c513a965982655753421621663b55333df' 
  AND token = '7GXN5k+oCcuQU3knRxFWyUr5ntEm3bKSPfPcWZ/U3hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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