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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45a8ad1e9191d787434d818fbe7ed8e202978f2fd94c43bac95c9dcb915b186a' 
  AND token = '5cNTJOHzDvFyLGF44LEDWZ+yeRx/k83glbtQ/X4vsec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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