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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5caa02f1d2adfc78abfbbf83bed962d268e6a4f2b661da76766c3c107a2e6ed' 
  AND token = '5xCrR7KBdM2s5L8/518P6ks6Xex6HRbHESRlGsdks2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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