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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f93e03195e8424e0be077e1ae7b81936d60c2f9f099974c5d6e46ef5e92524f' 
  AND token = 'Cy0bn/eGIuYA/uU76IzPPQipG2gbfDtn/DPSIXp+H8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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