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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98750996ffca9a482b913c8ff8c6c1360d29a6c323a6011a16da71f2b14e358d' 
  AND token = 'udu/undYoj9YA0Ht7RoMcz2cZ6uCP8eP3gIGPL8WYRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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