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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e7b346f87298a5ff6d82c57829a4e7699d02c42d97d4f5da7b89c3d191ab75' 
  AND token = '0nb+EEI0qZiNFu0fPyvkSrQmp4FbtM26EyMsTr+i6V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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