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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3e50873f744b3a38adda03b4248fb6b7737303ae6e84368ad878e8d9874bbf' 
  AND token = 'YzZjyh8F41Ck7FCCiNwZn3eh0fDw1e01CAKXvNWnMEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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