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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a880693c14d3fad948dd15d9a534dd4d97a1d1d9cab3ece69d64e81fc0805ca' 
  AND token = '3W+629QkSj7D8pRBA8sMYgbayw3Wpy5e+teEzW+Brhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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