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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e8c9cb522a158e53e722a23dcaabcd7b8abef40fe3d990f17bc0839dd233e5' 
  AND token = 'NAKW4ullTmTYHtf2mLNN7rT2WwknTpWabCoJLAbsu1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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