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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd13079902c3e08994b04843a512de7f92b00a40b3d4480bd965b0efb35684dd' 
  AND token = 'FsqRS+EO31t/ZYQHSQd+O+S4om1qwllWaauxWnA74xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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