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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567c596a2fe68ac5909809bce57423ad360613b705cca6c1bcc62c7e0ae5d77f' 
  AND token = 'bMoRIedFHPe+C5S5fq3z3T7R0PcPPuz/aHpjLUE4usw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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