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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b218b72a947d22fb0cb1c2f6e1e76a91c9a2da5f686ab07863fe4f1cab281d' 
  AND token = 'Z1uZPixI5rMbE6Af1l7AL+hAFs9IrQOHBP338woKpuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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