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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b8a09cdaaac5970da35b99b203b37e5d002ddb62b806c80b489c530a36cce6' 
  AND token = 'SgtJ19bzAACiawcJAn982bZeHmy4nFS7BAijV5QK1u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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