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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a3f9819351e87e580ceea379a3e248b31377dfca727d02788220f77aa6c178' 
  AND token = 'K6SWqdvf/53Wlzu+bISQ0Gm4L/nt+MiA1l0ZFqNzAZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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