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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8d30bb79ca553d5e78454654fa2312c44febafa81f74882bbf768b9aff890a' 
  AND token = '73T/2yf0IT5GNnZJ2ip64BMhsP4VmoYJkRP4W78Ls+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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