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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814fbe120e6d59fa4686554b5210ee78596d2c108c36ced3bccc37b2eed56813' 
  AND token = 'yYyYN0ZPIPj8RYR5SbzdKi51HYMtqS7ADnVE9x+wXGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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