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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ea8a121d48c83753646161ea1873e9a2698c6c765f2d64d0831a616660e291' 
  AND token = 'XStyFUD7YCd4/OdXXjNpD6NAvW58XiI8HX6OsQuYk8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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